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    <script>
        const arr = [1, 2, 3, 4, 5, 6];
        // es5
        // const a = arr[0];
        // const b = arr[1];

        // es6
        const [a, b, ...rest] = arr;
        // a: 1
        // b: 2
        // rest: [3, 4, 5, 6]
        console.log(arr);
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